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CHAPTER 2 PIN FUNCTION
Preliminary User’s Manual U16035EJ1V0UM
2.3 Pin I/O Circuits and Recommended Connection of Unused Pins
Table 2-1 shows the types of pin I/O circuit and the recommended connections of unused pins.
Refer to Figure 2-1 for the configuration of the I/O circuit of each type.
Table 2-1. Pin I/O Circuit Types
Pin Name
I/O Circuit Type
I/O
Recommended Connection of Unused Pins
P00/INTP0 to P02/INTP2
8-C
I/O
Input:
Independently connect to V
SS0
via a resistor.
P03/INTP3/ADTRG
Output: Leave open
P10/ANI0 to P13/ANI3
25
Input
Connect to V
DD0
or V
SS0
.
P20/SI30
8-C
I/O
Input:
Independently connect to V
DD0
or V
SS0
via a
P21/SO30
5-H
resistor.
P22/SCK30
8-C
Output: Leave open.
P23/RxD0
P24/TxD0
5-H
P25/ASCK0
8-C
P34/SI31
8-C
I/O
Input:
Independently connect to V
DD0
or V
SS0
via a
P35/SO31
5-H
resistor.
P36/SCK31
8-C
Output: Leave open.
P40 to P47
5-H
I/O
Input:
Independently connect to V
DD0
via a resistor.
Output: Leave open.
P50 to P57
5-H
I/O
Input:
Independently connect to V
DD0
or V
SS0
via a
P70/TI00/TO0
8-C
I/O
resistor.
P71/TI01
Output: Leave open.
P72/TI50/TO50
P73/TI51/TO51
P74/PCL
5-H
P75/BUZ
RESET
2
Input
—
XT1
16
Connect to V
DD0
.
XT2
—
Leave open.
AV
DD
—
Connect to V
DD0
or
V
DD1
.
AV
REF
Connect to V
SS0
or
V
SS1
.
AV
SS
IC (for mask ROM version)
Connect directly to V
SS0
or
V
SS1
.
V
PP
(for flash memory version)